8502A
1
.
The exponent
is replaced with
an extra digit of res-
olution.
2. Error codes are disabled.
Only spurious readings
will now denote selection
of an invalid function.
3. The overrange
indication
is
disabled.
NOTE
When changing
from
one
function .to another,
or upon entering the Cal mode,
memory modes
will be deactivated. Stored
values will be
retained. Use
of
RESET or interruption
of
power to the
8502A
will
erase memory entries.
2-63.
OFFSET
2-64.
The Offset mode
can
be used
to automatically sub-
tract
a number from the measured
input and display the
result. The subtracted offset number may be:
1
.
Any currently displayed
value
.
2.
A programmed numeric entry (ranging from
+10^
to
-10^).
2-65. The displayed reading
in Offset mode will exliibit
no increase in digit resolution.
Only one offset factor at a
time can be stored.
A
function change will deactivate Offset
mode; the stored
value will be retained.
A
flashing H will
appear in
the
exponent display should more than
40V
appear between the input terminals
when in Offset mode.
2-66.
SCALING
2-67.
The Scaling mode
may be used to automatically
divide
a measured input
by
a programmed
number or
by
an
applied value. This feature
essentially provides the ability
to
program an external reference
without standard external
reference limitations in
range, in fact, scaling values
may
range from
+10^
to
+10'®
and from -lO^to
—
10"®.
A
scaling factor
of 0
is
not allowed. Scaled readings
will con-
tain
3
significant digits if
the original reading
had 3 or less
significant digits. For more
than 3 significant
digits
in
the
original reading, the scaled reading will
display
the same
number of significant digits.
Only one scaling factor
may be
stored at a
time.
A
function change
will deactivate the
Scaling mode
but retain the stored factor.
NOTE
If
the
8502A is in both Scaling and
Offset,
the scaling
factor
will
be applied first; the
scaled displayed values will then
be
offset.
2-68.
ZEROING
2-69.
There
are two methods of zeroing
the
8502A.
Either
method may be used in
the 100 mV range or
the
1
0 ohm range
.
2-70.
VDC/Ohms Zero
2-71. Correction
for internal
dc
drift
can be
made
by
applying a good quality,
low thermal short between
HI and
LO
terminals
(not between test leads). If
necessary, repeat
this operation once the instrument
has warmed
up. Only
dc volts zero factors
may be recalled.
2-72.
Zeroing with
OFFSET
2-73.
After zeroing
for internal drift,
separate
dc
volts
and
2-wire ohms measurement corrections
can be made
by
shorting the
test leads and storing
the reading as an offset
factor.
2-74.
Systems
Use of the
8502A
2-75.
The availability
of optional interface
modules
makes the
8502A
adaptable to
a large variety
of
digital
sys-
tems.
Operating
and
programming
instructions
related
to
remote operation are
included with the
appropriate optional
module.
Overall information
on remote interfacing
can be
found in Fluke
Application Bulletin —25
“System
Use of
the Fluke
Model
8500A”,
Specific
information
about the
IEEE interface (-05
Option) may be
found in Fluke Appli-
cation
Bulletin
—36.
Application Bulletin
—37
“Unique
Measurements Using
the 8500 Series
Digital Voltmeter”
will
also
be useful for both
local and systems use
of the
8502A.
2-76.
OPERATING
DIRECTIONS
2-77.
Initial Settings
2-78.
Upon
applying
power to the
8502A, the
display
will
read:
“HI-2.0.Y”
(“Y” will be the number of the software version
employed
in
your instrument.) Then:
“CXXXXX”
(“X” will be identifying numbers for
installed options.)
The
instrument will now assume
the following status:
1 . V
DC function
2.
lOOOV
range
3. Slow reading rate
(7)
4. Fast filter (FO)
2-8
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